JP5342583B2 - Battery cell control device and battery cell - Google Patents

Description

  The present invention relates to a technical field of a battery cell control device that is mounted on a chargeable / dischargeable battery cell and can determine the degree of deterioration of the corresponding battery cell by detecting the internal resistance value of the battery cell.

  2. Description of the Related Art In recent years, a battery in which battery cells such as a lithium ion secondary battery, a nickel metal hydride battery, and a lead battery are connected in series or in parallel as a large current charging / discharging power source mounted as a driving power source in an electric vehicle or a hybrid electric vehicle Module is used. In particular, lithium ion secondary batteries are characterized by high energy density, high input / output density, and long cycle life. Therefore, research and development in this field are actively conducted.

  The battery module basically needs to be maintained by taking appropriate recycling measures such as replacement when the deterioration degree progresses with time and the deterioration degree reaches a predetermined value. Such recycling timing varies depending on the use conditions (use time, use environment, etc.) of the battery module. Therefore, there is a demand for smooth and efficient maintenance of the battery module by automatically monitoring the degree of deterioration of the battery module.

  In response to such a request, for example, in Patent Document 1, in a management device mounted on a battery module composed of a plurality of battery cells, battery information of battery modules (specifically, resistance, capacity, battery usage time, resistance, etc.) A technology is disclosed in which a rate of change, a rate of change of capacity, and a battery usage intensity) are accumulated in a database, and graded for reuse according to the degree of deterioration based on the accumulated battery information. According to this, for example, an individual with a low degree of degradation is used for a large current application, an individual with a large degree of degradation is used for a small current application, or an individual with a large degree of degradation is discarded. It is said that operation according to the deterioration degree of the battery module can be performed.

JP 2007-141464 A

  However, in the above-mentioned Patent Document 1, since the management device is provided for each battery module, the grade can be classified according to the degree of deterioration of the whole battery module, but the degree of deterioration is evaluated for each battery cell constituting the battery module. Can not do it. Some battery modules cannot be graded according to the degree of deterioration of the entire battery module. This type of battery module is basically composed of a combination of the same type of battery cells, but actual battery cells have considerable differences in individual differences and the environment in which they are placed (for example, temperature and humidity). Variations occur in the degree of progress of the deterioration degree of each battery cell. Therefore, even when it is determined that the degree of deterioration of the entire battery module is large, there are cases where the degree of deterioration of a specific battery cell is still small. In Patent Document 1, even in such a case, since all battery cells are treated as having a high degree of deterioration, there is a problem in that efficient operation cannot be performed in units of battery cells. In particular, since battery cells used for power sources of loads that require a large current, such as electric vehicles and hybrid electric vehicles, have a large capacity, it is important to evaluate and manage the degree of deterioration in units of battery cells. Thereby, the deterioration degree of the whole battery module can also be evaluated.

  Further, in Patent Document 1, grade classification for reuse is performed based on battery information stored in a database. As specific examples of this battery information, its own resistance, capacity, battery use time, resistance change rate, capacity change rate, battery use strength are described, but in any case, the battery information is a condition (temperature) And humidity). Therefore, in order to evaluate the degree of deterioration between battery modules under various circumstances based on a common standard, it is necessary to perform complicated calculation processing on the terminal side from which the battery information is read. Therefore, it is necessary to prepare a terminal capable of advanced calculation processing, and it is difficult to easily evaluate the degree of deterioration such as grade classification. In particular, when using an electric vehicle or a hybrid electric vehicle, it is required that such a battery module check can be easily performed in various places such as a gas station or a dealer. There is a problem that is difficult.

  The present invention has been made in view of the above problems, and includes a battery cell control device capable of easily evaluating the degree of deterioration in units of battery cells constituting the battery module with high accuracy, and the battery cell control device. It is an object to provide a battery cell.

In order to solve the above problems, a battery cell control device according to the present invention is mounted on a chargeable / dischargeable battery cell, and based on the internal resistance value of the battery cell detected by internal resistance detection means, In the battery cell control device capable of determining the degree of deterioration, a charge degree detection means for detecting and storing the charge degree of the battery cell, a temperature detection means for detecting the temperature of the battery cell, the detected internal resistance value, and the charge Storage means for storing the temperature and temperature as history data, and a deterioration signal of the battery cell is calculated from the internal resistance value based on the history data stored in the storage means, and a determination signal corresponding to the calculated deterioration degree and a signal output means for outputting, the deterioration degree of the battery cells, the calculated normalized the detected internal resistance value in the detected charged degree and temperature, said signal output means further Wherein characterized Rukoto such an output state for informing to that effect when the battery cell is the cell controller has been removed.

  According to the present invention, the deterioration degree of the battery cell is output as a determination signal normalized by the temperature and the charge degree stored as the history data. Therefore, on the terminal side that receives the determination signal and performs the evaluation, it is not necessary to perform complicated calculation processing in consideration of the condition where the battery cell is placed. Therefore, it is possible to easily evaluate the degree of deterioration with a simple terminal, and it is possible to respond to general spread requests. In addition, since such a battery cell control device is mounted on each battery cell constituting the battery module, the deterioration degree is evaluated for each battery cell, and more efficient recycling operation of the battery cell is realized. It becomes possible to do.

Preferably, in the storage means, the correspondence of the degree of deterioration Dc to the normalized internal resistance value Rcr is expressed by the following equation using the function fd: Dc = fd (Rcr)
It may be stored in advance as table data defined based on the above. The normalized internal resistance value Rcr is a difference between the detected charging degree S and the preset reference charging degree Sc, and the detected temperature T and the preset reference temperature Tc. Using the function fs having the deviation as a variable, the following formula is used: Rcr = fs ((T−Tc), (S−Sc))
It is good to calculate by. In this way, by normalizing the detected internal resistance value based on the preset reference charge level and reference temperature, it is possible to accurately evaluate the degree of deterioration of battery cells under various conditions. .

  As one aspect of the present invention, the signal output means may output a determination signal having a level set in advance according to the calculated degree of deterioration. Thereby, the deterioration degree of a battery cell can be evaluated by the very easy process of determining the level of the level on the receiving side of the determination signal.

Further, the signal output means further ing the output states for informing to that effect when the battery cell from the battery cell control device has been removed. As described above, in the present invention, the deterioration degree of the battery cell is calculated based on the history data stored in the storage means, but when the battery cell control device is removed from the battery cell, the history data is It becomes incomplete, and it becomes impossible to calculate an accurate deterioration degree. In this aspect, when the battery cell control device is removed even once, it becomes in an abnormal state (for example, a state in which an abnormal signal for notifying the abnormality is output), so that it is distinguished from the normal state and such an error is made. It is possible to prevent the deterioration degree from being evaluated. Further, by outputting an abnormal signal, unauthorized use of the battery cell such as intentionally removing the battery cell control device and diverting it can be prevented.

  The storage means may erase the history data when the battery cell control device is removed from the battery cell even once. According to this, by intentionally erasing the history data necessary for the degree of deterioration, it can be clearly distinguished in the determination signal that the product is not a normal product.

  The signal output means may further output a management information signal including management information for specifying the specification of the battery cell. In this case, since the terminal of the terminal that receives the signal can identify the specification of the battery cell based on the management information signal, the terminal can be distinguished from the non-genuine product.

  Preferably, a display panel for performing display corresponding to the signal output from the signal output means may be provided. In this aspect, the battery cell control device itself can grasp the state (deterioration degree, management information, etc.) of the battery cell based on the display on the display panel. Therefore, it is possible to easily manage the battery cells only by visually observing the battery cell control device without using a terminal for receiving the output signal.

  In order to solve the above-described problems, a battery cell according to the present invention is equipped with the above-described battery cell control device (including the above-described various aspects). Thereby, the battery cell which can evaluate a deterioration degree etc. easily with a highly accurate deterioration degree in the battery cell unit which comprises a battery module is realizable.

  According to the present invention, the deterioration degree of the battery cell is output as a determination signal normalized by the temperature and the charge degree stored as the history data. Therefore, on the terminal side that receives the determination signal and performs the evaluation, it is not necessary to perform complicated calculation processing in consideration of the condition where the battery cell is placed. Therefore, it is possible to easily evaluate the degree of deterioration with a simple terminal, and it is possible to respond to general spread requests. In addition, since such a battery cell control device is mounted on each battery cell constituting the battery module, the deterioration degree is evaluated for each battery cell, and more efficient recycling operation of the battery cell is realized. It becomes possible to do. Further, by evaluating some representative cells in the battery module, it is possible to evaluate the entire battery module to which they belong.

It is a schematic diagram which shows the structure of the battery module formed by combining the battery cell carrying the battery cell control apparatus which concerns on this invention. It is a schematic diagram showing a mode that the test | inspection including evaluation of a deterioration degree is performed about the battery cell 1 carrying the battery cell control apparatus which concerns on this invention using a terminal. It is a block diagram which shows the internal structure of the battery cell control apparatus which concerns on this invention. It is a block circuit diagram which shows the detection method of the internal resistance by the internal resistance detection means of the battery cell control apparatus which concerns on this invention. It is a flowchart figure which shows the processing content of the historical data performed in the process part of the battery cell control apparatus which concerns on this invention. 5 is a correspondence table showing a correspondence relationship between a degree of degradation, a rank, and a degradation level signal level. It is a block diagram which shows the internal structure of the terminal which receives battery information via a communication cable.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  FIG. 1 is a schematic diagram showing a configuration of a battery module 100 formed by combining battery cells 1 on which a battery cell control device 10 according to the present invention is mounted. The battery module 100 is housed in a state in which a plurality of battery cells 1a, 1b, 1c,... Are arranged in a battery container (not shown), and these battery cells 1a, 1b, 1c,. The adjacent positive electrode terminal 2 and negative electrode terminal 3 are connected in series by a lead wire 4. Thus, the secondary battery cells 1 connected in series with each other form an assembled battery, and are configured to cope with charge / discharge of a large current. In the specification of the present application, these secondary battery cells are collectively referred to as “battery cells 1”. When the individual battery cells are distinguished from each other, the “battery cells 1a, 1b, 1c,...

  The battery cell control apparatus (Cell Monitoring Unit: CMU) 10 which concerns on this invention is attached to the outer wall side surface of each battery cell 1a, 1b, 1c. The CMU 10 is a monitoring unit for monitoring the battery state of the attached battery cell 1 and detects various parameters relating to the battery state of the battery cell 1 such as current, voltage, temperature, and charge degree from the attached battery cell 1. Possible means (specific means will be described later in detail). And it is comprised so that the various parameters detected by these means can be analyzed and analyzed, and the signal according to the result can be output.

  The battery module 100 in this embodiment is a battery for an electric vehicle or a hybrid electric vehicle that requires a large current, and the battery cell 1 uses a lithium ion secondary battery cell that can charge and discharge a large current. . The battery cell 1 may use another secondary battery cell such as a nickel metal hydride battery or a lead battery depending on the application. In the present embodiment, the case where the secondary battery cells 1 are connected in series will be described in detail, but the same applies to the case where the secondary battery cells 1 are connected in parallel.

  FIG. 2 is a schematic diagram showing a state in which an inspection including evaluation of the degree of deterioration is executed using the terminal 30 for the battery cell 1 on which the battery cell control device 10 according to the present invention is mounted. As described above, a plurality of similar battery cells 1 are accommodated in the battery module 100 in series, but actually, these battery cells 1 have individual differences and differences in installation locations in the battery container. Therefore, the progress of the degree of deterioration between the battery cells 1 is different. The terminal 30 connects the communication cable 20 to the CMU 10 mounted on each battery cell 1 and acquires information on the battery state of the battery cell 1 stored in the CMU 10, thereby acquiring the information on the battery cell based on the acquired content. It is a terminal capable of evaluating the battery state including the degree of deterioration.

  In the present embodiment, the terminal 30 is described as a portable device that can be connected to the CMU 10 by the wired communication cable 20, but instead, it is installed at a predetermined point such as a management base and is a wireless line such as an Internet line. A device that can communicate with the CMU 10 via a network may be used.

  A communication cable 32 that can be connected to a connection terminal (not shown) of the battery cell 10 extends from the receiving unit 31 of the terminal 30, and battery information is exchanged between the CMU 10 and the terminal 30 via the communication cable 32. Is made. In addition, the terminal 30 is provided with a display panel 32 for displaying a result of evaluation performed based on the received battery information, and a user of the dedicated terminal 30 can use the dedicated terminal 30 via the display panel 32. It is comprised so that the evaluation result by 30 can be recognized visually.

3 is a block diagram showing the internal configuration of the battery cell control device 10 according to the present invention. The battery cell control device 10 includes internal resistance detection means 11, charge degree detection means 12, and temperature detection means 13 for detecting internal resistance, charge degree, and temperature as battery information of the battery cell. As shown in FIG. 4, the internal resistance detection means 11 includes an ammeter 21 provided in series with the battery cell 1 composed of an electromotive force and an internal resistance component, and a voltmeter 22 provided in parallel with the battery cell 1. Based on the measured current value Ia and voltage drop ΔVc, the internal resistance Rc is expressed by the following equation: Rc = ΔVc / Ia (1)
Detect by.

  Although the calculation of the internal resistance Rc can be performed both when the battery cell 1 is charged and discharged, it is preferable to calculate the internal resistance at the time of discharging when the flowing current value is large because accuracy is good.

  Further, the charge level detection means 12 is a charge amount sensor for detecting the charge level (State of Charge: SOC) of the battery cell, and the temperature detection means 13 is a temperature sensor such as a thermistor element or a thermocouple.

  Returning to FIG. 3 again, the battery information such as the internal resistance, the charge degree, and the temperature detected by the internal resistance detection means 11, the charge degree detection means 12, and the temperature detection means 13 is stored in the storage means 14 that is a nonvolatile memory. Is done. The storage means 14 stores these battery information as history data by recording them in association with the recording date and time. The detection by the internal resistance detection means 11, the charge degree detection means 12, and the temperature detection means 13 is executed at a preset periodic or irregular timing, and is accumulated in the storage means 14 as needed.

  Here, the processing unit 15 generates an output signal to be output from the signal output unit 16 by performing the process described below on the history data stored in the storage unit 14. FIG. 5 is a flowchart showing the processing contents of history data performed in the processing unit 15.

  First, the processing unit 15 reads the history data stored in the storage unit 14 by accessing the storage unit 14 (step S101). Here, among the history data, the internal resistance Rc (= ΔVc / Ia) detected by the internal resistance detection means 11 is calculated by the charge degree S of the battery cell 1 detected by the charge degree detection means 12 and the temperature detection means 13. It depends on the detected cell temperature T of the battery cell 1. Therefore, the processing unit 15 normalizes the detected internal resistance Rc by the charge degree S and the temperature T (step S102), and calculates the deterioration degree Dc, which is a parameter independent of the battery cell state (temperature, charge degree, etc.). (Step S103).

The contents of steps S102 and S103 will be specifically described as follows. The dependence of the internal resistance Rc on the temperature T and the degree of charge S can be determined by the following equation Rc = fs (T, S): where fs is an arbitrary function (2)
It is grasped in advance and stored in the storage means 14 in advance. The processing unit 15 acquires the dependency relationship by accessing the storage unit 14.

Subsequently, in order to normalize the internal resistance Rc, the processing unit 15 detects the dependence of the internal resistance Rc defined in the equation (2) on the temperature T and the charge degree S by the charge degree detection unit 12. The deviation (S-Sc) between the charge level S and the preset reference charge level Sc, and the deviation (T-Tc) between the temperature T detected by the temperature detecting means 13 and the preset reference temperature Tc. Using the function fs as a variable, the following equation Rcr = fs ((T−Tc), (S−Sc)) (3)
(Step S102). As described above, by introducing the function fs using the variables based on the preset reference charging degree Sc and the reference temperature Tc, the internal resistance Rc depending on the charging degree and the temperature can be normalized. In addition, it is good to employ | adopt 25% which shows normal temperature as reference temperature Tc, and 50% which is an intermediate value as reference | standard charge degree.

On the other hand, in the storage unit 14, the correspondence relationship of the deterioration degree Dc with respect to the internal resistance value Rcr normalized by the equation (3) is expressed by the following equation using the function fd: Dc = fd (Rcr) (4)
Is stored in advance as table data defined based on the above. In this way, by normalizing the detected internal resistance value Rc based on the preset reference charging degree Sc and reference temperature Tc, the deterioration degree Dc is accurately evaluated for battery cells under various conditions. can do.

  Subsequently, the processing unit 15 determines whether or not there is an abnormality history in the history data read in step S101 (step S104). The abnormality history referred to here is, for example, the degree of deterioration compared to normal operation, such as when the temperature of the battery cell reaches a high temperature equal to or higher than a predetermined value, or the degree of charge of the battery cell exceeds the charge upper limit value or the charge lower limit value. This means the history of events that can progress. If there is an abnormality history (step S104: YES), the deterioration degree Dc calculated in the equation (4) is corrected to be added according to the content of the abnormality history (step S105). Here, the correction value of the deterioration degree Dc may be stored in a storable area such as the storage unit 14 corresponding to the contents of the abnormality history. On the other hand, when there is no abnormality history (step S104: NO), the deterioration degree Dc calculated in the equation (4) is adopted as it is without correction.

  And the process part 15 produces | generates the deterioration degree signal according to the deterioration degree Dc calculated in this way (step S106). As shown in FIG. 6, the level of the degradation level signal is set stepwise based on the rank corresponding to the calculated level of degradation level Dc. For example, when the degree of deterioration Dc is in the range of “0-10%”, it is set to the “rank A” level as a new state with no or almost no deterioration. Further, when the degree of degradation Dc is in the range of “10-40%”, it is set to the “rank B” level as a new old product state that maintains a sufficient performance although there is a slight degradation. The Further, when the degree of deterioration Dc is in the range of “40-80%”, although the deterioration has progressed to some extent, it is still in a used product state that can withstand use depending on the intended use. Is set. Further, when the degree of deterioration Dc is in the range of “80-100%”, the level is set to the “rank D” level because it is in a waste state where deterioration has progressed and it is difficult to continue using.

  In this example, ranks A and B are still excellent in performance, and thus show a degree of deterioration that can be used for applications that require charging and discharging with a large current, such as electric vehicles and hybrid electric vehicles. Rank C is not suitable for electric vehicles or hybrid electric vehicles that require a high-performance battery, but it can be used for general storage battery applications with a relatively small charge / discharge current. Indicates the degree of deterioration. Rank D indicates that the degree of deterioration has deteriorated to such an extent that it is not suitable for use as a general battery for power storage.

  The degradation level signal generated in the processing unit 15 in this way is transmitted to the signal output unit 16 (step S107) and is output from an output terminal (not shown) provided in the CMU 10. As a result, the terminal 30 on the reception side of the deterioration level signal can evaluate the deterioration level of the battery cell 1 only by an extremely easy process of determining the level of the deterioration level signal.

  The storage unit 14 stores in advance management information of the battery cell 1 in which the CMU 10 is mounted, for example, information including various specifications such as a manufacturer, a model, and a serial number. The processing unit 15 reads the management information stored in the storage unit 14, generates the management information signal, and outputs the management information signal to the output terminal together with the above-described deterioration degree signal. As a result, the terminal 30 that receives the signal can identify the specification of the battery cell based on the management information signal, so that it can be distinguished from the non-genuine product.

  Further, the CMU 10 is provided with an abnormality detection means 18 capable of detecting an abnormality when the CMU 10 is removed from the battery cell 1 even once. The abnormality detection means 18 may determine whether or not there is an abnormality based on whether or not the detection value of the ammeter 21 or the voltmeter 22 shown in FIG. When an abnormality is detected by the abnormality detection means 18, the processing unit 15 generates an abnormality signal for notifying the occurrence of the abnormality, and the output terminal from the signal output means 16 together with the above-described deterioration degree signal and management information signal. Output to.

  As described above, the degree of deterioration of the battery cell 1 is calculated based on the history data stored in the storage unit 14, but when the CMU 10 is removed from the battery cell 1, the history data is incomplete. Therefore, it becomes impossible to calculate an accurate deterioration degree. In this aspect, by outputting an abnormal signal when the CMU 10 is removed, it is possible to distinguish from the normal state and prevent such an erroneous evaluation of the deterioration degree. Further, by outputting an abnormal signal, unauthorized use of the battery cell 1 such as intentionally removing and diverting the CMU 10 can be prevented.

  More preferably, the processing unit 15 may delete the history data from the storage unit 14 when the CMU 10 is removed from the battery cell 1. According to this, by intentionally erasing the history data necessary for the degree of deterioration, it can be clearly distinguished even in the determination signal that it is not normal.

  Next, FIG. 7 is a block diagram illustrating an internal configuration of the terminal 30 that receives battery information via the communication cable 20. First, the receiving unit 33 receives a deterioration degree signal, an abnormality signal, and a management information signal from the CMU 10 side via the communication cable 20. These received signals are sent to the determination unit 34, and the degree of deterioration is evaluated based on a correspondence table stored in advance in the storage unit 35. Here, the correspondence table stored in the storage unit 35 is the same as the reference shown in FIG. That is, by comparing the level of the received deterioration level signal with the correspondence table, the rank of the battery cell 1 can be determined very easily without performing complicated calculation processing.

  The determined rank, the presence / absence of the received abnormal signal, and the contents of the management information signal are displayed on the screen by the display panel unit 32. At this time, in addition to the determined rank, the details of the battery status used to calculate the deterioration level (for example, integrated current value, internal resistance value, maximum temperature record, minimum temperature record, etc.) are also displayed. May be.

  In the present embodiment, in addition to the display panel 32 in the terminal 30, the on-cell display unit 17 is also provided in the CMU 10 itself. Thereby, it is not necessary to use the terminal 30 for receiving the output signal, and the battery cell 1 can be easily managed only by visually observing the CMU 10.

  As described above, according to the CMU 10 according to the present embodiment, the deterioration degree of the battery cell 1 is output as a determination signal normalized by the temperature and the charge degree stored as the history data. Therefore, on the terminal 30 side that receives the determination signal and performs the evaluation, it is not necessary to perform complicated calculation processing in consideration of the condition where the battery cell 1 is placed. Therefore, it is possible to easily evaluate the degree of deterioration with a simple terminal 30, and it is possible to respond to a general spread request. Moreover, since such CMU10 is mounted in each battery cell 1 which comprises the battery module 100, evaluation of a deterioration degree is performed per battery cell, and more efficient recycling operation of the battery cell 1 is implement | achieved. Is possible.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a battery cell control device that is mounted on a chargeable / dischargeable battery cell and can determine the degree of deterioration of the battery cell by detecting the internal resistance value of the battery cell.

DESCRIPTION OF SYMBOLS 1 Battery cell 2 Positive electrode terminal 3 Negative electrode terminal 4 Lead wire 10 Battery cell control apparatus (CMU)
DESCRIPTION OF SYMBOLS 11 Internal resistance detection means 12 Charge amount detection means 13 Temperature detection means 14 Storage means 15 Processing part 16 Signal output means 17 On-cell display part 20 Communication cable 30 Terminal 31 Reception part 32 Display panel 33 Reception part 34 Determination part 35 Storage part 100 Battery module

Claims (8)

In the battery cell control device that is mounted on the chargeable / dischargeable battery cell and can determine the degree of deterioration of the battery cell based on the internal resistance value of the battery cell detected by the internal resistance detection means.
A degree of charge detection means for detecting and storing the degree of charge of the battery cell;
Temperature detecting means for detecting the temperature of the battery cell;
Storage means for storing the detected internal resistance value, charge degree and temperature as history data;
A signal output means for calculating a deterioration degree of the battery cell from an internal resistance value based on history data stored in the storage means, and outputting a determination signal corresponding to the calculated deterioration degree;
The degree of deterioration of the battery cell is calculated by normalizing the detected internal resistance value with the detected charge level and temperature ,
It said signal output means further includes a battery cell control apparatus according to claim Rukoto such an output state for informing to that effect when the battery cell from the battery cell control device has been removed. In the storage means, the correspondence of the degree of deterioration Dc to the normalized internal resistance value Rcr is expressed by the following formula Dc = fd (Rcr)
The battery cell control device according to claim 1, wherein the battery cell control device is stored in advance as table data defined on the basis of the above. The normalized internal resistance value Rcr represents a deviation between the detected charging degree S and a preset reference charging degree Sc, and a deviation between the detected temperature T and a preset reference temperature Tc. Using the function fs as a variable, the following equation Rcr = fs ((T−Tc), (S−Sc))
The battery cell control device according to claim 2, wherein the battery cell control device is calculated by:   4. The battery cell according to claim 1, wherein the signal output unit outputs a determination signal having a level set in a stepwise manner in accordance with the calculated degree of deterioration. 5. Control device. 2. The battery cell control device according to claim 1 , wherein the storage unit erases the history data when the battery cell control device is once removed from the battery cell. It said signal output means further includes a battery cell control apparatus according to any one of claims 1 to 5, and outputs the management information signal including the management information for identifying the specifications of the battery cell. The battery cell control device according to any one of claims 1 to 6 , further comprising a display panel that performs display corresponding to the signal output from the signal output means. A battery cell comprising the battery cell control device according to any one of claims 1 to 7 .

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